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<FONT color="green">001</FONT>    package org.apache.commons.net.ntp;<a name="line.1"></a>
<FONT color="green">002</FONT>    /*<a name="line.2"></a>
<FONT color="green">003</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.3"></a>
<FONT color="green">004</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.4"></a>
<FONT color="green">005</FONT>     * this work for additional information regarding copyright ownership.<a name="line.5"></a>
<FONT color="green">006</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.6"></a>
<FONT color="green">007</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.7"></a>
<FONT color="green">008</FONT>     * the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    /***<a name="line.20"></a>
<FONT color="green">021</FONT>     * Common NtpUtils Helper class.<a name="line.21"></a>
<FONT color="green">022</FONT>     *<a name="line.22"></a>
<FONT color="green">023</FONT>     * @author Jason Mathews, MITRE Corp<a name="line.23"></a>
<FONT color="green">024</FONT>     *<a name="line.24"></a>
<FONT color="green">025</FONT>     * @version $Revision: 489397 $ $Date: 2006-12-21 16:28:51 +0000 (Thu, 21 Dec 2006) $<a name="line.25"></a>
<FONT color="green">026</FONT>     */<a name="line.26"></a>
<FONT color="green">027</FONT>    public final class NtpUtils {<a name="line.27"></a>
<FONT color="green">028</FONT>    <a name="line.28"></a>
<FONT color="green">029</FONT>        /***<a name="line.29"></a>
<FONT color="green">030</FONT>          * Returns 32-bit integer address to IPv4 address string "%d.%d.%d.%d" format.<a name="line.30"></a>
<FONT color="green">031</FONT>          *<a name="line.31"></a>
<FONT color="green">032</FONT>          * @param address  the 32-bit address<a name="line.32"></a>
<FONT color="green">033</FONT>          * @return  the raw IP address in a string format.<a name="line.33"></a>
<FONT color="green">034</FONT>          */<a name="line.34"></a>
<FONT color="green">035</FONT>         public static String getHostAddress(int address)<a name="line.35"></a>
<FONT color="green">036</FONT>         {<a name="line.36"></a>
<FONT color="green">037</FONT>              return ((address &gt;&gt;&gt; 24) &amp; 0xFF) + "." +<a name="line.37"></a>
<FONT color="green">038</FONT>                     ((address &gt;&gt;&gt; 16) &amp; 0xFF) + "." +<a name="line.38"></a>
<FONT color="green">039</FONT>                     ((address &gt;&gt;&gt;  8) &amp; 0xFF) + "." +<a name="line.39"></a>
<FONT color="green">040</FONT>                     ((address &gt;&gt;&gt;  0) &amp; 0xFF);<a name="line.40"></a>
<FONT color="green">041</FONT>         }<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>        /***<a name="line.43"></a>
<FONT color="green">044</FONT>         * Returns NTP packet reference identifier as IP address.<a name="line.44"></a>
<FONT color="green">045</FONT>         *<a name="line.45"></a>
<FONT color="green">046</FONT>         * @param packet  NTP packet<a name="line.46"></a>
<FONT color="green">047</FONT>         * @return  the packet reference id (as IP address) in "%d.%d.%d.%d" format.<a name="line.47"></a>
<FONT color="green">048</FONT>         */<a name="line.48"></a>
<FONT color="green">049</FONT>         public static String getRefAddress(NtpV3Packet packet)<a name="line.49"></a>
<FONT color="green">050</FONT>         {<a name="line.50"></a>
<FONT color="green">051</FONT>             int address = (packet == null) ? 0 : packet.getReferenceId();<a name="line.51"></a>
<FONT color="green">052</FONT>             return getHostAddress(address);<a name="line.52"></a>
<FONT color="green">053</FONT>         }<a name="line.53"></a>
<FONT color="green">054</FONT>    <a name="line.54"></a>
<FONT color="green">055</FONT>        /***<a name="line.55"></a>
<FONT color="green">056</FONT>         * Get refId as reference clock string (e.g. GPS, WWV, LCL). If string is<a name="line.56"></a>
<FONT color="green">057</FONT>         * invalid (non-ASCII character) then returns empty string "".<a name="line.57"></a>
<FONT color="green">058</FONT>         * For details refer to the &lt;A HREF="http://www.eecis.udel.edu/~mills/ntp/html/refclock.html#list"&gt;Comprehensive<a name="line.58"></a>
<FONT color="green">059</FONT>         * List of Clock Drivers&lt;/A&gt;.<a name="line.59"></a>
<FONT color="green">060</FONT>         *<a name="line.60"></a>
<FONT color="green">061</FONT>         * @param message<a name="line.61"></a>
<FONT color="green">062</FONT>         * @return reference clock string if primary NTP server<a name="line.62"></a>
<FONT color="green">063</FONT>         */<a name="line.63"></a>
<FONT color="green">064</FONT>        public static String getReferenceClock(NtpV3Packet message) {<a name="line.64"></a>
<FONT color="green">065</FONT>            if (message == null)<a name="line.65"></a>
<FONT color="green">066</FONT>                return "";<a name="line.66"></a>
<FONT color="green">067</FONT>            int refId = message.getReferenceId();<a name="line.67"></a>
<FONT color="green">068</FONT>            if (refId == 0)<a name="line.68"></a>
<FONT color="green">069</FONT>                return "";<a name="line.69"></a>
<FONT color="green">070</FONT>            StringBuffer buf = new StringBuffer(4);<a name="line.70"></a>
<FONT color="green">071</FONT>            // start at highest-order byte (0x4c434c00 -&gt; LCL)<a name="line.71"></a>
<FONT color="green">072</FONT>            for (int shiftBits = 24; shiftBits &gt;= 0; shiftBits -= 8)<a name="line.72"></a>
<FONT color="green">073</FONT>            {<a name="line.73"></a>
<FONT color="green">074</FONT>                char c = (char) ((refId &gt;&gt;&gt; shiftBits) &amp; 0xff);<a name="line.74"></a>
<FONT color="green">075</FONT>                if (c == 0) break; // 0-terminated ASCII string<a name="line.75"></a>
<FONT color="green">076</FONT>                if (!Character.isLetterOrDigit(c))<a name="line.76"></a>
<FONT color="green">077</FONT>                    return "";<a name="line.77"></a>
<FONT color="green">078</FONT>                buf.append(c);<a name="line.78"></a>
<FONT color="green">079</FONT>            }<a name="line.79"></a>
<FONT color="green">080</FONT>            return buf.toString();<a name="line.80"></a>
<FONT color="green">081</FONT>        }<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>        /***<a name="line.83"></a>
<FONT color="green">084</FONT>         * Return human-readable name of message mode type (RFC 1305).<a name="line.84"></a>
<FONT color="green">085</FONT>         *<a name="line.85"></a>
<FONT color="green">086</FONT>         * @param mode<a name="line.86"></a>
<FONT color="green">087</FONT>         * @return mode name<a name="line.87"></a>
<FONT color="green">088</FONT>         */<a name="line.88"></a>
<FONT color="green">089</FONT>        public static String getModeName(int mode)<a name="line.89"></a>
<FONT color="green">090</FONT>        {<a name="line.90"></a>
<FONT color="green">091</FONT>            switch (mode) {<a name="line.91"></a>
<FONT color="green">092</FONT>                case NtpV3Packet.MODE_RESERVED:<a name="line.92"></a>
<FONT color="green">093</FONT>                    return "Reserved";<a name="line.93"></a>
<FONT color="green">094</FONT>                case NtpV3Packet.MODE_SYMMETRIC_ACTIVE:<a name="line.94"></a>
<FONT color="green">095</FONT>                    return "Symmetric Active";<a name="line.95"></a>
<FONT color="green">096</FONT>                case NtpV3Packet.MODE_SYMMETRIC_PASSIVE:<a name="line.96"></a>
<FONT color="green">097</FONT>                    return "Symmetric Passive";<a name="line.97"></a>
<FONT color="green">098</FONT>                case NtpV3Packet.MODE_CLIENT:<a name="line.98"></a>
<FONT color="green">099</FONT>                    return "Client";<a name="line.99"></a>
<FONT color="green">100</FONT>                case NtpV3Packet.MODE_SERVER:<a name="line.100"></a>
<FONT color="green">101</FONT>                    return "Server";<a name="line.101"></a>
<FONT color="green">102</FONT>                case NtpV3Packet.MODE_BROADCAST:<a name="line.102"></a>
<FONT color="green">103</FONT>                    return "Broadcast";<a name="line.103"></a>
<FONT color="green">104</FONT>                case NtpV3Packet.MODE_CONTROL_MESSAGE:<a name="line.104"></a>
<FONT color="green">105</FONT>                    return "Control";<a name="line.105"></a>
<FONT color="green">106</FONT>                case NtpV3Packet.MODE_PRIVATE:<a name="line.106"></a>
<FONT color="green">107</FONT>                    return "Private";<a name="line.107"></a>
<FONT color="green">108</FONT>                default:<a name="line.108"></a>
<FONT color="green">109</FONT>                    return "Unknown";<a name="line.109"></a>
<FONT color="green">110</FONT>            }<a name="line.110"></a>
<FONT color="green">111</FONT>        }<a name="line.111"></a>
<FONT color="green">112</FONT>    <a name="line.112"></a>
<FONT color="green">113</FONT>    }<a name="line.113"></a>




























































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